swupdate: add libsystemd dependency
swupdate: add libsystemd dependency

If systemd support is enabled in SWUpdate,
add dependency on libsystemd.

Signed-off-by: Christian Storm <9b0ad956043d7985515d8cbb7db6d934a5db2634@siemens.com>

sbabic/meta-swupdate,sbabic/meta-swupdate